Head of the Potsdam Institute and climate change advisor to the German government, Professor John Schellnhuber explains why COP15 is based on out-of-date science, but why he still has hope for a positive outcomemore...

Copenhagen: 25/50 of 106

There's a popular myth that without the US Congress passing a climate change bill, President Obama can't sign up to binding emissions targets. It's wrong, says Kassie Siegel, of the Center for Biological Diversitymore...